Skiving-machine



n asheetsK-sneen .1, W. S. FITZGERALD. Skiving-Maohine.-

10.228,183. Pate'nredJuneI, 1880.

Wir/'Messe 3.-. Imfezwf vN- Fm PHOTO-LIYHGGRAFHER. WASHINGTON. D C.

UNITLD STATES PATENT OFFICE.

VALTER S. FITZGERALD, OF BOSTON, MASSACHUSETTS.

SKIVING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 228,183, dated June 1,1880,

` Application filed January 24, 1880.

To all whom it may concern:

Be it known that I, WALTER S. FITZGER- ALD, of Boston, county ofSuffolk', State of Massachusetts, have invented an Improvement inSkiving-Machines, of which the following` description, in connectionwith the accompanying drawings, is a specification.

The invention relates to skiving-machines for skiving leather for theuppers and other parts of boots and shoes.

Heretofore such machines have been so constructed as to be almostuseless for the skiving of the liner grades of leather, such asglove-calf, kid, Sac., on account of the extreme difficulty of feedingthem to the knife without causing them to crease or pucker, and also onaccount of the carerequired to keep the knife sharp, it having beennecessary in nearly all machines to remove the knife in order i tosharpen it.

The object of my invention is to provide a skiving-machine by which thelightest-grades of leather may be skived without creasing, puckering, orstretching the same, and in which the cutting-knife will be kept sharpwithout the use of complicated gearing.

Myinvention consists in the employment, in a skiving-machine, of a`rotatable table or support for the material, combined with apivotedbearing by which to incline the axis of the table more or yless from avertical position with relation to the plane of movement of theskiving-knife, whereby the inclination or bevel formed at. the edge lofthe material by the knife may be made more or less abrupt; also, in thecombination, with the rotatable table and disk-knife and feeding stud orroller, of a guard to prevent the material being skived from overridingthe disk-knife; also, in the combination, with the rotatable table andf'eed stud or roller, of a presser adapted to be pressed down upon thesurface of the material, to produce pressure thereon outside of theserrated part of the feed-stud when it is desired to trim outwardlycurved or convexed edges of pieces of leather; also, in the peculiararrangement hereinafter described of pulleys and belts for connectingand operating the disk-knife and grinder. y

Figure l is a front-end View of a device embodying my invention. Fig. 2is a side view of the same. Fig. 3 is a plan thereof, and Fig. 4 is adetail of the screW-shanked feedstud.

In the frame B, whose base A is secured by bolts or otherwise to a tableor bench, is mounted the driven shaft C, suitably journaled in boxes orbearings D E, the bearing E being vertically adjust-able in the head Fof the frame B by means of a screw,I G, and spiral spring g upon and inthe top of the frame-head F, the stop-pin Hin the side thereof beneaththe journal or bearing E, as shown in Fig. 2 of the drawings,determining its lowest position.

The bearing D (see dotted lines, Fig. 3) in the portion I of the frameB, through which the shaft C passes, is made externally like a doublecone, and, supported at its central part only, is free to rock as theshaft C is adjusted by the screw G. The feeding stud or roller J is, asherein shown, screwed into the end of the shaft G, (see detail, Fig. 4,)and preferably forming part of this feed-stud are two smooth-surfacedwheels, J2 J2, to prevent the fingers of the operator from being cut bythe disk-knife r.

At one side of the frame F, and secured to it by screw f', is a guard,f2, which is extended forward in the groove 3, under and between thewheels J 2, and under the edge of the disk-knife r, the said guideserving to prevent the material riding up over the said knife. Upon thisframe F is secured by screw f a presser, f3, which is extended forwardinto the groove 4 at the outer end of the serrated part of thefeed-stud, where the said presser just touches the upper surface of thematerial being skived, it being supported upon the table K.

When convexed or outwardly-curved edges are to be skived, and at noother time, this presser f3 is temporarily forced down, by hand orotherwise, upon the surface of the material, causing its edge to beforced against the edgegage M', located at the rear of the table K, andmade adjustable by means of a screw, m', which holds the shank m of thegage, the latter being inserted in a suitable hole in the bearing L,pivoted at l', the said bearing L also serving to receive and hold theaxis It of the table K.

The pivot Z. for the bearing L is extended through ears of a block, N,having a projection,

IOOv

2 QQSJSS while by the screw l2 the bearing L may be l held in anydesired position, according to the inclination it is desired the axis 7cof the table to occupy, for the purpose hereinbefore described. Aclearer, j, at the rear of the ser- V`-rated feed-stud acts to clear thegrooves of the said stud from particles of leather.

In the drawings I have shown a presserplate, x, which, if desired, maybe employed in front of the feed-stud to hold down the material. Aframe, O, secured by means of a screw, o, to the head F, carries uponits face a supplementary frame, P, vertically adjustable by means of aset-screw, p, at the rear of the frame O. In one end of this frame Pisjournaled the knife carrying shaft It, having at its lower end thecircular knife r, which is vertically adjustable by means of a screwnut,S, at the upper end of the shaft. Upon the center of the shaftIt,betweenthe bearings p p', is fixed a dri\f'ingpulley, T, about which passes thebelt t, and thence around the'horizontal guide-pulleys b b upon thebracket U, the Lipper one of which is provided with a groove, b2, forthe reception of the belt of the grinder-pulley y. The belt t thenpasses above the vertical guide-pulley V, and about the pulley W infront of the drivingpulley X on the shaft O.

The shaft y of the grinding-wheel Y has its bearin gs in part of theframeP, which supports the knife-shaft, and by means of the nut g3 onthe shaft y it may be raised or lowered to remove the grinding-wheelfrom or place it so as to run in contact with and grind or sharpen thedisk-cutter r. The shaft lyis set at an inclination to the shaft R ofthe disk-cutter, in

order that the under or beveled face of the emery or other grinding'wheel may properly bevel and sharpen the disk-knife.

A piece of leather to be skived,being` placed upon the rotatable table,will be operated upon by the serrated part of the feed stud or device,and'will be carried forward to the disk-knife, the acting' edge of whichextends partially under the said feed-stud.

I claim- 1. In a skiving-niachine, a rotatable table or support for thematerial and a knife, combined with a pivoted bearing` to support theaxis of the table and permit it to be adjusted more or less from avertical position, substantially as described.

2. The rotatable table, disk-knife, and feeding stud or roller, combinedwith the guard extended under the disk-knife, as described, to preventthe material overriding,` it, substantially as set forth.

3. The rotatable table and feedstud 'and edge-gage M, combined with thepresser f3, to operate when con vexed edges are being skived,substantially as described.

4. The disk-knife, its shaft, and means to adjust it vertically, and therotatable feed-stud, combined with the rotatable table K, having` itsaxis set at an inclination to the axis of the disk-knife, substantiallyas described.

5. In a skivingI-machine, the driving-pulley W on the shaft C, theguide-pulley V, andthe pulleys b b', arranged with relation to eachother as described, and the belts t y2, combined with the pulleys T andy of the'shafts R and y, substantially as described.

In testimony whereof I have signed myname to this specification in thepresence of two subscribing witnesses.

WALTER S. FITZGERALD.

Witnesses:

G. W. GREGORY, L. F. CONNOR.

